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WO2008067996A1 - Dispositif de chauffage à micro-ondes - Google Patents

Dispositif de chauffage à micro-ondes Download PDF

Info

Publication number
WO2008067996A1
WO2008067996A1 PCT/EP2007/010530 EP2007010530W WO2008067996A1 WO 2008067996 A1 WO2008067996 A1 WO 2008067996A1 EP 2007010530 W EP2007010530 W EP 2007010530W WO 2008067996 A1 WO2008067996 A1 WO 2008067996A1
Authority
WO
WIPO (PCT)
Prior art keywords
microwave
frequency
microwaves
drying
mhz
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2007/010530
Other languages
German (de)
English (en)
Inventor
Marcel Mallah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fricke und Mallah Microwave Technology GmbH
Original Assignee
Fricke und Mallah Microwave Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fricke und Mallah Microwave Technology GmbH filed Critical Fricke und Mallah Microwave Technology GmbH
Priority to EP07856371A priority Critical patent/EP2100479B1/fr
Priority to JP2009539657A priority patent/JP2010511980A/ja
Priority to DE502007006433T priority patent/DE502007006433D1/de
Priority to AT07856371T priority patent/ATE497686T1/de
Priority to PL07856371T priority patent/PL2100479T3/pl
Publication of WO2008067996A1 publication Critical patent/WO2008067996A1/fr
Priority to US12/478,264 priority patent/US20090302031A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/241—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening using microwave heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair

Definitions

  • the invention relates to a microwave heating device and a method for heating Wärmungsgut, such. B. for drying ceramic materials and moldings with microwaves, preferably using this drying device.
  • the focus of the present invention are industrial drying methods and microwave heating devices for the treatment of various, in particular ceramic materials and mineral insulating materials.
  • the energy input to the core of a product is usually associated with conventional drying processes with conventional heat generation for a very long time, since the temperature gradient is slow from the Layer surface spreads into the interior of the product to be dried.
  • microwaves have a comparatively high penetration depth for well-insulating products, such as ceramic materials, and also heat the irradiated volume more uniformly through direct coupling.
  • microwave dryers are in principle well suited for all drying tasks of materials or moldings with embedded aqueous components or solvents which a Dipolmoment, i. have a high dielectric constant.
  • microwave drying are therefore also extensively used industrially for the production process of the soot or diesel particle filters (RPF), which are also required in large quantities, and also known as microparticle filters.
  • RPF diesel particle filters
  • These large-sized ceramic components with a micro-honeycomb structure and preferably a cylindrical geometry are needed in large numbers in the auto industry. They usually consist of silicon carbide (SiC) or mixed ceramics with a high silicon carbide content.
  • SiC silicon carbide
  • mixed ceramics with a high silicon carbide content.
  • microwave ovens are increasingly gaining in importance because of the aforementioned advantageous properties of microwave radiation.
  • continuous-flow drying systems are particularly frequently used for the heat treatment of ceramic materials.
  • the drying methods used for various tasks are implemented there by arranging, controlling and parameterizing the various system components.
  • the dry material on a belt conveyor is usually transported through several heating zones and the drying time can be regulated by the belt speed.
  • microwave generators are arranged, preferably above and below the belt conveyor, by means of which acting in the drying zones antennas microwaves are radiated to the dry matter.
  • the dry material such as Microparticle filter body are heated as uniformly as possible in its entire volume on the drying section.
  • microwave dryers are often equipped with additional hot air atomizing systems and corresponding suction devices to support the drying process and to remove the resulting vapors.
  • the high humidity in the oven should prevent the different degrees of shrinkage, as well as the formation of cracks and wrinkles.
  • the high moisture content in this known solution should also lead to undesirably prolonged drying times and increase the necessary heating power for the drying process.
  • the device disclosed in DE 10 353 784 A1 attempts to improve the process by specifically controlling the drying process of ceramic molded articles by sensory detection of the local distribution and position of the dry material in a drying chamber and control of the microwave radiation output and / or emission direction of a plurality is used by arranged microwave generators.
  • the frequency of the microwave generators used here should be selected from a frequency range of 300 MHz to 300 GHz.
  • the object of the present invention is therefore to propose a microwave heating method and a microwave heating device which avoid the disadvantages of prior art methods and drying devices and enable as far as possible stress-free uniform drying, in particular in the volume of the ceramic dry material. At the same time, however, the necessary drying times in the drying devices used should also be optimized in order to reduce costs.
  • a microwave heating device and a method for microwave heating is provided, which is equipped with one or more microwave generators, which are designed such that the dry matter to be treated with a first microwave frequency from the upper frequency band of the internationally permissible microwave frequencies (ISM frequencies) by one or irradiated several microwave generators and irradiated simultaneously or successively with a second frequency from the lower frequency range of the internationally permissible lower frequency band by one or more microwave generators.
  • ISM frequencies internationally permissible microwave frequencies
  • the frequencies used from the upper frequency range lower penetration depths, but a more uniform field distribution of the microwaves are realized and by the irradiation frequencies used from the lower frequency range, a higher penetration depth and better coupling is realized in the deeper layers of the volume.
  • microwave generators In all known from the practice microwave drying devices microwave generators are used, which operate at a frequency of 2.45 GHz, ie the same frequency as the widely used microwave household appliances.
  • This ISM frequency Industrial, Scientific and Medical applications is one of the microwave frequencies permitted worldwide for heating purposes.
  • the drying process using this frequency does not provide satisfactory results and is associated with some difficulties, which is caused in particular by the low penetration of the microwaves into the ceramic material. It has been found that the penetration depth is an important measure of the location of the heat development in the volume of the material to be heated. But the size and geometry of the dry material play a crucial role in the formation of the internal temperature profile. According to the fact that the distribution of the internal heat sources in relation to the layer thickness of the material to be heated can be influenced by the microwave frequency used, it is proposed according to the invention to irradiate the dry matter to be heated with one or more different microwave frequencies, preferably equal to or at a high frequency greater 2.45 GHz and a lower frequency equal to or less than 1000 MHz.
  • inventive application of these mechanisms in a microwave drying device enable a new more efficient drying process by irradiation of the ceramic dry product by matching microwaves of different frequencies and a process controlled microwaves performance, which avoids the disadvantages of previously known methods.
  • the inventive microwave drying device is equipped with a plurality of microwave generators, which are each technically constructed so that they can radiate different frequencies, preferably from the upper and the lower frequency range on the dry material.
  • the proposed drying device for supporting the drying process can advantageously be supplemented and supported by further system components.
  • the additional arrangement of a known hot-air atomization system with suction device for supporting the drying process and removal of moisture has proved to be advantageous.
  • one or more additional dampening systems in the drying zones of the continuous ovens or drying chambers result in more uniform drying of the workpieces under a controlled steam atmosphere.
  • the cracking and deformation on the surface of the ceramic moldings can be minimized and significant quality improvements can be achieved.
  • Fig. 2 shows the microwave oven according to the invention, which is designed as a chamber furnace 2.
  • microwave drying devices in various designs for drying ceramic shaped bodies are known from the prior art.
  • dry goods such as assemblies of sanitary engineering or the particularly important ceramic filter inserts of silicon carbide (SiC) for soot particulate filter of the automotive industry microwave generators are used with a frequency of 2.45 GHz.
  • SiC silicon carbide
  • Attempts are made to combat the quality deficiencies (crack formation and deformations, etc.) of the dry material resulting from partial overheating of surface areas and the formation of uneven thermal gradients in the volume by the measures already described.
  • the microwave drying device (FIG. 1) used in this exemplary embodiment initially does not fundamentally differ from known system concepts and is designed as a continuously operating continuous drying oven 1 for ceramic shaped bodies having a plurality of microwave generators 3, 4.
  • Absorber zones 6, 12 are also provided for the dry material inlet and outlet on the drying oven, which are adapted to the type and geometry of the dry material to be introduced.
  • the two absorber zones should prevent the escape of microwave radiation into the surroundings of the furnace, but in particular from the furnace entrance area 12 and the exit area 6.
  • combined reflection and absorption locks in the entry and exit areas can also be used advantageously.
  • the arrangement of several field guides 8 in the ceiling region of the drying chamber 11 is advantageous.
  • the dry material is conveyed by continuous conveyor belt 7 through the drying chamber 11 of the furnace.
  • the drying chamber is constantly supplied with certain quantities of fresh air to remove the moisture arising from the drying process 5, 9 and is sucked off at the outlet 10.
  • a chamber furnace 2 is shown in a further embodiment of the invention.
  • the dry material is placed on an arranged in the drying chamber 13 turntable 14 and rotated comparable to domestic microwave ovens during drying.
  • the coupling of the present invention different frequencies via the coupling elements 3 and 4.
  • the chamber furnace requires a continuous ventilation and exhaust 9, 10 for the removal of moisture.
  • ceramic shaped bodies are used as cylindrical filter inserts for microparticle filters.
  • Their honeycomb cell structure is particularly sensitive to greater temperature and humidity differences during drying, which can lead to material tensions, cracks or fractures and jeopardizes the usability.
  • the microwave generators for generating a higher frequency and the microwave generators for generating a lower frequency are arranged above and below the conveyor belt of the individual drying zones.
  • the high-frequency microwave generators operate at a frequency of 2.45 GHz. In this frequency range, the microwaves couple into near-surface areas, which leads to increased heat development in these areas.
  • the microwave frequency is increased from 2.45 GHz to 5.8 GHz, in particular by selecting a suitable dielectric, not only does the penetration depth of the Radiation, but also the heating power density directly below the surface of the dry material is increased.
  • microwaves from the frequency range of 900 MHz to 1000 MHz have a much greater penetration depth into the ceramic material to be dried.
  • the heat input is increased in the inner volume of the dry material, whereby the drying process is accelerated significantly accelerated.
  • microwave fields in this lower permissible frequency range increasingly show inhomogeneities in the field distribution, so that in certain cases the arrangement of suitable reflectors in the drying chambers is advantageous.
  • the low frequency microwave generators operate at a frequency of 915 MHz and are mounted primarily in the rear of the continuous furnace.
  • the penetration depth and thus the microwave frequency used has proved to be an important measure of the geometric distribution (heat sources) of the heat development in the volume of the material to be heated, the size and geometry of the dry material in the formation of the internal temperature profile plays a role to be considered.
  • the microwave energy can be used very effectively for the selection of suitable frequencies for particular material geometries and very advantageously for the drying process.
  • the present inventive method for microwave drying and the proposed microwave drying device allow a dry treatment of particular large-volume ceramic moldings, which compared to known methods and equipment faster product throughput, ie shorter drying times possible, as well as largely stress and crack-free products.
  • the microwave heating device according to the invention and the method according to the invention can also be used for heating other materials than ceramics and for purposes other than drying, such as for heating preforms in the manufacture of components made of fiber composite or wood materials or for heat-induced curing, for example.
  • Networking of various substances LIST OF REFERENCE NUMBERS
  • Microwave drying oven designed as continuous oven Microwave drying oven designed as chamber oven Microwave coupling 2.45 FH, coupling element Microwave coupling 915 MHz, coupling element Supply air / convection air for hot air / mixed operation Absorber zone for preventing microwave leakage radiation Conveyor belt (single or reversible) Field guide for microwaves Supply air Feeder Exhaust air supply Microwave drying chamber of the continuous furnace Absorber zone Microwave drying chamber of the metal chamber furnace of any shape Turntable with dry material

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Drying Of Solid Materials (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Furnace Details (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Electric Ovens (AREA)
  • Resistance Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

L'invention concerne un dispositif de chauffage à micro-ondes, en particulier pour matériaux en céramique et pièces moulées, présentant plusieurs générateurs micro-ondes pour le rayonnement de micro-ondes d'une fréquence de 300 MHz à 5,8 GHz et l'injection sur le produit à sécher. L'invention concerne également un procédé de chauffage, en particulier de matériaux en céramique ou de pièces moulées, utilisant le dispositif de chauffage à micro-ondes précité (1, 2), caractérisé par l'utilisation simultanée de plages de fréquences micro-ondes différentes sur le produit à chauffer. L'invention permet ainsi d'obtenir, en particulier, un séchage plus uniforme et avec une meilleure élimination des tensions, par exemple des matériaux en céramique et, principalement, des filtres à particules diesel.
PCT/EP2007/010530 2006-12-06 2007-12-05 Dispositif de chauffage à micro-ondes Ceased WO2008067996A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP07856371A EP2100479B1 (fr) 2006-12-06 2007-12-05 Dispositif de chauffage à micro-ondes
JP2009539657A JP2010511980A (ja) 2006-12-06 2007-12-05 マイクロ波加熱装置
DE502007006433T DE502007006433D1 (de) 2006-12-06 2007-12-05 Mikrowellenheizungseinrichtung
AT07856371T ATE497686T1 (de) 2006-12-06 2007-12-05 Mikrowellenheizungseinrichtung
PL07856371T PL2100479T3 (pl) 2006-12-06 2007-12-05 Mikrofalowe urządzenie ogrzewające
US12/478,264 US20090302031A1 (en) 2006-12-06 2009-06-04 Microwave Heater

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006057780 2006-12-06
DE102006057780.9 2006-12-06
DE102007028595 2007-06-19
DE102007028595.9 2007-06-19

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/478,264 Continuation US20090302031A1 (en) 2006-12-06 2009-06-04 Microwave Heater

Publications (1)

Publication Number Publication Date
WO2008067996A1 true WO2008067996A1 (fr) 2008-06-12

Family

ID=39325611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/010530 Ceased WO2008067996A1 (fr) 2006-12-06 2007-12-05 Dispositif de chauffage à micro-ondes

Country Status (7)

Country Link
US (1) US20090302031A1 (fr)
EP (1) EP2100479B1 (fr)
JP (1) JP2010511980A (fr)
AT (1) ATE497686T1 (fr)
DE (1) DE502007006433D1 (fr)
PL (1) PL2100479T3 (fr)
WO (1) WO2008067996A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010228219A (ja) * 2009-03-26 2010-10-14 Ngk Insulators Ltd ハニカム成形体の乾燥方法
JP2012500140A (ja) * 2008-08-20 2012-01-05 コーニング インコーポレイテッド 電極コンセントレーターを用いるセラミック生地を乾燥させるための方法
DE102016119463A1 (de) 2016-10-12 2018-04-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen zur kontinuierlichen Erwärmung einer Pressgutmatte
DE102018105385A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten
DE102018105390A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten

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Publication number Priority date Publication date Assignee Title
CN102814268B (zh) * 2012-07-09 2015-07-15 上海志鹤水性涂料科技有限公司 微波水性木器漆家具提水干燥涂装设备及涂装方法
DE102015122976A1 (de) 2015-12-30 2017-07-20 Sig Technology Ag Vorrichtung und Verfahren zum Erhitzen von Zuschnitten und/oder Packungsmänteln und/oder Verpackungen aus Verbundmaterial durch Orientierungspolarisation
FR3058138B1 (fr) * 2016-10-28 2019-02-01 Centre National De La Recherche Scientifique Procede de traitement thermique d’une piece en materiau ceramique par micro-ondes
US9849708B1 (en) 2017-02-23 2017-12-26 Ricoh Company, Ltd. Microwave dryer of a print system with modulation of the microwave source using frequency shift keying
DE102017114733A1 (de) 2017-06-30 2019-01-03 Sig Technology Ag Vorrichtung und Verfahren zum Erhitzen von Zuschnitten und/oder Packungsmänteln und/oder Verpackungen aus Verbundmaterial durch Orientierungspolarisation
EP3732985A1 (fr) * 2019-05-02 2020-11-04 Metalquimia, S.A.U. Installation de décongélation et procédé de décongélation de produits de viande surgelée brute dans un culbuteur à tambour
CN110328862A (zh) * 2019-07-18 2019-10-15 佛山市高明金石建材有限公司 一种石英石生产线上的固化加热装置
EP3888885B1 (fr) 2020-04-02 2023-07-26 Fricke und Mallah Microwave Technology GmbH Four convoyeur à micro-ondes
AU2021386464A1 (en) * 2020-11-24 2023-06-22 Technological Resources Pty. Limited Biomass direct reduced iron
CN120532709B (zh) * 2025-07-25 2025-10-21 上海申众捷科技有限公司 一种基于变频微波的车身油漆干燥方法及系统

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AU565393B2 (en) * 1983-08-23 1987-09-17 Microwave Power Consultants Pty Ltd Microwave treatment of materials
US20030189039A1 (en) * 1998-06-09 2003-10-09 Peter Vinden Method for increasing the permeability of wood

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DE1183615B (de) * 1959-04-15 1964-12-17 Litton Industries Inc Hoechstfrequenz-Heizvorrichtung
DE1818464U (de) * 1960-07-04 1960-09-22 Mikrowellen Ges M B H Deutsche Mikrowellen-durchlaufofen.
US3448384A (en) * 1965-10-23 1969-06-03 Allan W Scott Integral microwave radiating and generating unit for heating
US3771234A (en) * 1969-09-09 1973-11-13 Exxon Research Engineering Co Microwave drying process for synthetic polymers
AU565393B2 (en) * 1983-08-23 1987-09-17 Microwave Power Consultants Pty Ltd Microwave treatment of materials
US20030189039A1 (en) * 1998-06-09 2003-10-09 Peter Vinden Method for increasing the permeability of wood

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012500140A (ja) * 2008-08-20 2012-01-05 コーニング インコーポレイテッド 電極コンセントレーターを用いるセラミック生地を乾燥させるための方法
JP2010228219A (ja) * 2009-03-26 2010-10-14 Ngk Insulators Ltd ハニカム成形体の乾燥方法
DE102016119463A1 (de) 2016-10-12 2018-04-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen zur kontinuierlichen Erwärmung einer Pressgutmatte
DE102018105385A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten
DE102018105390A1 (de) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten
WO2019170300A1 (fr) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Four à passage continu et installation de fabrication de plaques de matériau en bois
WO2019170299A1 (fr) 2018-03-08 2019-09-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Four à passage continu et installation de fabrication de plaques de matériau en bois
DE102018105390B4 (de) * 2018-03-08 2020-08-20 Siempelkamp Maschinen- Und Anlagenbau Gmbh Durchlaufofen und Anlage zur Herstellung von Holzwerkstoffplatten

Also Published As

Publication number Publication date
EP2100479A1 (fr) 2009-09-16
DE502007006433D1 (de) 2011-03-17
EP2100479B1 (fr) 2011-02-02
PL2100479T3 (pl) 2011-07-29
JP2010511980A (ja) 2010-04-15
US20090302031A1 (en) 2009-12-10
ATE497686T1 (de) 2011-02-15

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